Coil support



G. W. HUEY.

ELECTRICAL SYSTEM.

FILED MAR. 9. 1912.

Mar. 13, 1923. 1,448,405.

WITNESSES: INVENTOR h 680756 L/Huey,

% ATTIORNEY 8. In a dynamo-electric machine, a core end projections are separated to engage two member provided with a coil, a supporting sides of the coil, the other end portions being 10 member, and a coil hanger comprising two attached. together and disposed in engagemembers of substantial] Z shape nested toment with said supporting member. gether one of said mem rs being provided In testimony whereof, I have hereunto with a relatively narrow web portion and subscribed my name this 3rd day of Sept, the other being provided with a relatively 1919. wide web portion, whereby certain of the SAMUEL C. HOEY.

.Patentecl Mar. 13, 1923.

GEORGE W. HUEY, F WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO \W'ESTING-HOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

ELECTRICAL SYSTEM.

Application filed March 9, 1917. Serial No. 158,548.

To all whom it may concern:

Be it known that I, GEORGE IV. HUEY, a citizen of the United States, and a. resident of VVilkinsbur in the county of Allegheny and State of Tennsylvania, have invented a new and useful Improvement in Electrical Systems, of which the following is a specification.

My invention relates to electrical systems and particularly to such systems'as embody protective devices for controlling the circuits of electric motors.

My invention has for its object to provide a simple and efiicient arrangement 16' whereby the circuits of electric motors are interrupted automatically upon the occurrence of abnormal conditions.

It is desirable, in the operation of electric motors, to disconnect them from the source of energy in case of reversal of phase of the electromotive force of the source. It

is well known that, under these circumstances, the conditions obtaining in the motor circuit are approximately short-circuit conditions. It is desirable, also, to interrupt the circuits of electric motors in case of failure of voltage of the source of energy in order that full voltage may not be applied to the motors when normal conditions are restored. The circuit should be interrupted, also, upon failure of voltage in one of the line conductors.

In the arrangement constructed in accordance with my invention, I employ a small torque motor that is connected to the source of energy by any suitable means, such, for example, as a current transformer. The torque motor controls the circuit of the actuating coil of a low-voltage release device.

The low-voltage release device constitutes means for tripping a circuit breaker of the usual and ordinary type. It will be readily understood that the circuit breaker operates upon the occurrence either of reversal of phase or failure of voltage of the source of energy.

In the drawing, the single figure is a diagrammatic view of circuits and apparatus embodying my invention.

Line conductors 1, 2 and 3, which may be connected to any suitable source of alternating electromotive force, supply energy to an alternating-current motor 4. The primary circuit of the motor is controlled by a circuit breaker 5. The circuit breaker is controlled by a low-voltage release device 6 having an actuating coil 7 and a movable core member 8 which opposes the force of a spring 9. The spring 9 tends to open the circuit breaker.

The circuit of the low-voltage release coil 7 is controlled by a three-phase tor ue motor 10 that is supplied with energy rom line conductors 1, 2 and rent transformer 11. The rotor of the torque motor 10 is operatively connected to an arm 12 which carries a contact member 13. A spring 14 tends to retain the arm 12 in such position that the contact member 13 is out of engagement with a stationary contact member 15. Under normal operating conditions, the motor 10 exerts a force which exceeds that of the spring 14.

and maintains the engagement of the contact members 13 and 15.

It may be assumed that the motor 4 is operating under normal conditions and that the various switching devices occupy theirrespective illustrated positions. In case of failure of line voltage, the coil 7, which is connected between line conductors 2 and 3, is deenergized and the spring 9 effects the opening of the circuit breaker 5. It is then necessary for the motor to be started in the usual manner.

In case of failure of voltage of one conductor, or failure of phase, which may be caused by the breaking of a conductor or the blowing of a fuse, the torque motor 10, which normally tends to rotate the arm 12 in a counter-clockwise direction, permits the spring 14 to rotate the arm 12 in a clockwise direction to effect disengagement of contact members 13 and 15. The coil 7 is thereupon de-energized and the circuit breaker 5 o ens as described in connection with the failure of line voltage.

If the phase relations of the transmission line are reversed, the torque of the motor 10 is reversed and the arm 12 is actuated to effect the disengagement of contact members 13 and 15 in the manner previously described. The circuit breaker 5 then opens the motor circuit.

The arrangement, whereby a single circuit-controlling device is controlled in accordance with both voltage conditions and phase relations of the source of energy, re

3 by means of a eur- 

